<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hi Martin,<div class=""><br class=""></div><div class=""> The vop threshold Chimera command can set all the map values below a specified density level to 0, and all the values above that level to 1 creating a mask. For example,</div><div class=""><br class=""></div><div class="">vop threshold #0 min 6.5 set 0 max 6.5 setmax 1</div><div class=""><br class=""></div><div class="">Then you can save the new map to a file with Volume Viewer menu entry File / Save Map... or command</div><div class=""><br class=""></div><div class="">vol #1 save ~/Desktop/mask.mrc</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Tom</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Oct 20, 2017, at 7:30 AM, Martin Lawrence wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><span style="font-size:12.8px" class="">Hi All,</span><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class="">Is there a quick and easy way in Chimera to impose a density level cutoff and write out a ccp4 style mask file?</div><div style="font-size:12.8px" class=""><br class=""></div><div style="font-size:12.8px" class="">Thanks,</div><div style="font-size:12.8px" class="">Martin</div><div style="font-size:12.8px" class=""><br class=""></div><div class=""><div class="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div class="">Martin Lawrence<br class="">Department of Chemistry and Biochemistry<br class="">Montana State University<br class="">Bozeman, MT 59717<br class=""></div>USA</div><div dir="ltr" class=""><br class=""></div></div></div></div></div></div></div>
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